Droppy extension to support folder security

Droppy is a now archived Javascript open source file sharing app

https://github.com/silverwind/droppy

It supports users with passwords but those users once created have access to everything. I’d like droppy changed to support folder security, where a user has their own folder and sub folders, they shouldn’t be able to see other users’ folders at all. A folder could potentially have multiple users, and those users couild be RW or R only.