I am reading this question differently, more on the ability to see the folders of my documents thru a call on my server that can into the Document Cloud that is integrated into my app. Usually you have many owners watching the approval process and the single person approach is a bit fragmented.
I am familiar with LC Content Services, so I would like to see the approach, where you have the folders layout , with hierarchical permissions, and all appropriate team members can see and start approvals from a pool of documents.
Anything like Sharepoint integration would be interesting as well.
Mike