zfs discuss - Jul 2009 - Snapshots and atime - OK to use atime for snapshot creation time?

I notice that on my ZFS filesystems the "atime" of snapshots is equal
to the snapshot creation time. Is this guaranteed to be kosher? It does not seem
to change when I read the snapshot:

#  ls -lu /blah/.zfs/snapshot
total 55
drwxr-xr-x  16 root     root          16 Jul  7 00:43 2009-07-07-00:43:29
drwxr-xr-x  16 root     root          16 Jul  8 06:59 2009-07-08-22:00:20
drwxr-xr-x  16 root     root          16 Jul  8 21:59 2009-07-09-21:52:45
drwxr-xr-x  16 root     root          16 Jul  9 21:52 2009-07-10-21:59:15
...
# ls -lR /blah/.zfs/snapshot/2009-07-07-00:43:29
# ls -lu /blah/.zfs/snapshot
total 55
drwxr-xr-x  16 root     root          16 Jul  7 00:43 2009-07-07-00:43:29
...

The ctime of the snapshot is the ctime of the filesystem, the mtime of the
snapshot is "Jul 21 2008" (???)
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