Are you aware of any documentation for this property?
The best I found was this link: http://dev.day.com/docs/en/crx/2-0/developing/development_tools/developing_with_crxde/conf iguring_crxde.html#Changing the mounted folders
It's old (CRX 2.0), and it's ambiguos as to whether child paths should work.
If you have some better links, I'm keen to look into it!
Only paths that are direct children of the root path / in CRX can be configured. In your case it is 2 level deep & does not get applied. Also CRXDE will be eol soon & feature enhancement request might not go through.
Thanks Sham, that's what I expected, but I appreciate the confirmation.