[AFS3-std] Snapshot Identifiers

[Matt W. Benjamin]

So the AFS protocol should provide access to the best available snapshot available relative to a point in time.  Does that mandate that snapshot generations are best regarded in the protocol as a timestamp per se?  I don't believe so.  Doing so appears to conflate a temporal search criteria with an ordinal (or opaque identifier).  It misbehaves near the maximum resolution, and seems to carry the assumption that all implementations will be producing effectively continuous snapshots. 

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