[Question] Which qcow2 options could be inherited to snapshot/blockcopy?

Hi, I'm trying to find out which qcow2 options could be inherited to snapshot/blockcopy and then test them. can know all the qcow2 options. As far as I know, size, cluster_size and extended-l2 have already been implemented. So I'm curious that: 1) What are the current status and future plans of other options? Like compat option. 2) Also whether the vol-clone can cover all options? Thank you very much. And please help to correct me if I have something wrong. Best Regards, Meina Li