Ah, thanks for the clarification. Although
I'm still curious about the reason.
Here's the section included for the archives:
CAVEATS
After a successful mount, the permissions on the original mount point de-
termine if ``..'' is accessible from the mounted file system. The mini-
mum permissions for the mount point for traversal across the mount point
in both directions to be possible for all users is 0111 (execute for all).
--
Antti Harri
