docs: def seed_args(subparsers):
      """Add command line options for the seed operation"""
      seed_parser = subparsers.add_parser('seed')
      secretfile_args(seed_parser)
      vars_args(seed_parser)
      seed_parser.add_argument('--mount-only',
                               dest='mount_only',
                               help='Only mount paths if needed',
                               default=False,
                               action='store_true')
      thaw_from_args(seed_parser)
      seed_parser.add_argument('--remove-unknown',
                               dest='remove_unknown',
                               action='store_true',
                               help='Remove mountpoints that are not '
                               'defined in the Secretfile')
      base_args(seed_parser)