Steven,
I found a similar thing when using find on a manually mounted and automounted mountpoint. (Solaris 2.6, not tried anything else but I will).
However, find /home/filer/* (even as root) didn't traverse snapshots
I also seemed to come across
mount filer:/vol/vol1/mnt find /mnt/users traversed snapshots but mount filer:/vol/vol1/users find /mnt did not (or the other way round!).
Something like that. Anyway in the end I concocted something that worked for me. Maybe some form of du -k * might help.
Roger