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The 'origin' and 'divergence time' of a snap volume should be recorded.
- Initially divergence time is the same as the creation time.
- If origin is deleted; origin should be updated to grand parent (origin -> origin)
divergence time should be updated to the most recent of (divergence time, origin divergence time)

- Show when a snapshot diverged from each of it's ancestors (a tree view would be nice)

This needs to be moved out from 7.3 - we already do have infrastructure for tracking LV ancestry, but we still need a way to track when the snapshot got written first after its creation (and hence tracking the divergence times). Probably requires also support on kernel side.

*** Bug 1240555 has been marked as a duplicate of this bug. ***

(In reply to Peter Rajnoha from comment #1)
> This needs to be moved out from 7.3 - we already do have infrastructure for
> tracking LV ancestry, but we still need a way to track when the snapshot got
> written first after its creation (and hence tracking the divergence times).
> Probably requires also support on kernel side.

I don't see us adding kernel support for a feature like this.  If users can tell when they created a snapshot, that's probably good enough.  If it turns out that customers are clamoring for this feature, we can reopen the bug and determine the best way to proceed.