Usage:
 findmnt [options]
 findmnt [options] <device> | <mountpoint>
 findmnt [options] <device> <mountpoint>
 findmnt [options] [--source <device>] [--target <path> | --mountpoint <dir>]

Find a (mounted) filesystem.

Data sources:
 -F, --tab-file <path>  alternative file for -s, -m or -k options
 -m, --mtab             search in table of mounted filesystems
                          (includes user space mount options)
 -k                     an alias for '--kernel=mountinfo'
 --kernel[=<method>]    search in kernel mount table (default behavior);
                          <method> is mountinfo or listmount
 -N, --task <tid>       use alternative namespace (/proc/<tid>/mountinfo file)
 -p, --poll[=<list>]    monitor changes in table of mounted filesystems
 -s, --fstab            search in static table of filesystems

Data filters:
 -A, --all              disable all built-in filters, print all filesystems
 -d, --direction <word> direction of search, 'forward' or 'backward'
 -f, --first-only       print the first found filesystem only
 -i, --invert           invert the sense of matching
     --id <num>         filter by mount node ID
     --uniq-id <num>    filter by mount node 64-bit ID (requires --kernel=listmount)
     --pseudo           print only pseudo-filesystems
 -Q, --filter <expr>    apply display filter
 -M, --mountpoint <dir> the mountpoint directory
     --shadowed         print only filesystems over-mounted by another filesystem
 -R, --submounts        print all submounts for the matching filesystems
     --real             print only real filesystems
 -S, --source <string>  the device to mount (by name, maj:min,
                          LABEL=, UUID=, PARTUUID=, PARTLABEL=)
 -T, --target <path>    the path to the filesystem to use
 -t, --types <list>     limit the set of filesystems by FS types
 -U, --uniq             ignore filesystems with duplicate target

Options:
 -a, --ascii            use ASCII chars for tree formatting
 -b, --bytes            print sizes in bytes rather than in human readable format
 -C, --nocanonicalize   don't canonicalize when comparing paths
 -c, --canonicalize     canonicalize printed paths
 -D, --df               imitate the output of df(1)
 -e, --evaluate         convert tags (LABEL,UUID,PARTUUID,PARTLABEL)
                          to device names
     --hyperlink[=<when>]
                        print paths as hyperlinks (always|never|auto)
 -I, --dfi              imitate the output of df(1) with -i option
 -J, --json             use JSON output format
 -l, --list             use list format output
 -n, --noheadings       don't print column headings
 -O, --options <list>   limit the set of filesystems by mount options
 -o, --output <list>    output columns (see --list-columns)
     --output-all       output all available columns
 -P, --pairs            use key="value" output format
 -r, --raw              use raw output format
     --tree             enable tree format output if possible
 -u, --notruncate       don't truncate text in columns
 -v, --nofsroot         don't print [/dir] for bind or btrfs mounts
 -w, --timeout <num>    upper limit in milliseconds that --poll will block
 -y, --shell            use column names to be usable as shell variable identifiers

 -x, --verify           verify mount table content (default is fstab)
     --verbose          print more details
     --vfs-all          print all VFS options

 -H, --list-columns     list the available columns
 -h, --help             display this help
 -V, --version          display version

For more details see findmnt(8).