FreeBSD/cddl/contrib/opensolaris/cmd/zfs/zfs_main.c
/*
 * zfs unshare -a
 * zfs unshare filesystem
 *
 * Unshare all filesystems, or a specific ZFS filesystem.
 */
zfs unshare -a
zfs unshare filesystem

Unshare all filesystems, or a specific ZFS filesystem.
zfs unshare - a zfs unshare filesystem Unshare all filesystems or a specific ZFS filesystem .
static int
zfs_do_unshare(int argc, char **argv)
{
	return (unshare_unmount(OP_SHARE, argc, argv));
}
static int zfs_do_unshare ( int argc , char * * argv ) { return ( unshare_unmount ( OP_SHARE , argc , argv ) ) ; }
zfs unshare -a
 zfs unshare filesystem
zfs unshare - a zfs unshare filesystem