[Attribute] Opaque [chflags flag] opaque [Owner-settable] Yes [OS support] All [Semantics and rationale] Directory is opaque when viewed through a union mount [ls flag] 
opaque
a r c h
o p a q u e
n o d u m p
s a p p n d
s c h g
u a p p n d
u c h g
h i d d e n