Perhaps one there is close to what you need; and you could extend/enhance it to match exact requirements. They range from really simple to full-fledged EDMS such as Mayan.
(Note: you may need supplementary apps as well - bearing in mind Django's modular (vs monolithic) design - so look at something like
https://www.djangopackages.com/packages/p/django-guardian/ to handle object permissions rather than expecting this to appear in a package dealing with file uploads or folder organisation.)