# file: .
# owner: root
# group: root
user::rwx
group::r-x
other::r-x

# file: y
# owner: root
# group: root
user::rwx
group::r-x
other::r-x
default:user::rwx
default:group::r-x
default:group:users:rw-
default:mask::rwx
default:other::r-x

# file: y/a
# owner: gast
# group: root
user::rw-
group::r-x	#effective:r--
group:users:rw-
mask::rw-
other::r--

# file: x
# owner: root
# group: root
user::rw-
user:gast:r-x
group::r--
mask::r-x
other::r--