mountpoint -x device
Show the major/minor numbers of the device that is mounted on the given directory.
Be quiet - don’t print anything.
Do not follow symbolic link if it the last element of the directory path.
Show the major/minor numbers of the given blockdevice on standard output.
Display version information and exit.
Display help text and exit.
success; the directory is a mountpoint, or device is block device on --devno
failure; incorrect invocation, permissions or system error
failure; the directory is not a mountpoint, or device is not a block device on --devno
enables libmount debug output.