snapshot timestamp

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We know snapshot is on a point of time. Is this point of time tracked internally by
some sort of sequence number, or the timestamp showed by "snap ls", or something else?

I noticed that when "deep cp", the timestamps of all snapshot are changed to copy-time.
Say I create a snapshot at 1PM and make a copy at 3PM, the timestamp of snapshot in
the copy is 3PM. If I rollback the copy to this snapshot, I'd assume it will actually bring me
back to the state of 1PM. Is that correct?

If the above is true, I won't be able to rely on timestamp to track snapshots.

Say I create a snapshot every hour and make a backup by copy at the end of the day.
Then the original image is damaged and backup is used to restore the work. On this
backup image, how do I know which snapshot was on 1PM, which was on 2PM, etc.?
Any advices to track snapshots properly in such case?

I can definitely build something else to help on this, but I'd like to know how much
Ceph can support it.

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