Do you know the exact folder in Library (~/Library) where other Versions related files are stored?
I've been able to trace most versions related files and file history by looking at the /.DocumentRevisions-V100 using a root account. But there is no /.DocumentRevisions-V100 on a ZFS volume, thus some information is obviously stored somewhere else.
Additionally 'permanent version storage' as Apple calls it is not quite permanent even on HFS+ volumes. Moving files within the same volume retains the history, but once you move or copy a versioned file to another HFS+ partition all the version history is lost (in my experience). I have found no information from Apple about this, and I think this is a serious shortcoming. Have you noticed the same thing?