kuchling

> Thanks! Could you elaborate on the differences to the existing `passthroughfs.py`? Might there be a way to merge the changes in there instead? Ext filesystem compatibility checked by https://github.com/zfsonlinux/fstest.git....

I do not need a new fs, it was choosen to not break other stuff and because different lower fs have different behavoir see second change, regarding time. The only...