zfsviz - Visualisation of ZFS dependencies

I had an interesting discussion with my colleague Dirk this morning. This discussion got to the point, that a tool visualizing the dependencies of filesystems, snapshots and clones would be helpful for the work with ZFS. Well … i used this evening and the warm weather on my balcony to develop a small script that feeds GraphViz with the nescessary data to create a graph of the dependencies. The script isn´t ready for a widespread release (volumes are missing) but I want to show you a first output.