Github user Leemoonsoo commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/767#issuecomment-194102700
I think way it implements is just treating '/' in the notebook title as a
directory separator in a front end side as described in
[ZEPPELIN-209](https://issues.apache.org/jira/browse/ZEPPELIN-209). and it is
not really related to the notebook storage.
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