def supported(fstab="/etc/fstab"):
""" verify that the system supports apt btrfs snapshots
by checking if the right fs layout is used etc
"""
# check for the helper binary
if not os.path.exists("/sbin/btrfs"):
return False
# check the fstab
fstab = Fstab(fstab)
entry = fstab.get_supported_btrfs_root_fstab_entry()
return entry is not None
