Thanks for the comments. So ZFS alone cannot do what I'd like.
In linux there Gamin. Or there is also a kernel patch which gives you /proc/fschanges. I could monitor this file for changes and take a snapshot when a change occurs or under certain circumstances. However, the Linux COW type FS are all not as production ready as ZFS. Does (Open)Solaris have a /proc/fschanges equivalent to monitor for FS activity?
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