My best guess is that it is not possible to mount a linux filesystem - unless it is made as an ISO9600 or a UDF formated filesystem.
AIX (IBM) uses the term vfs - for virtual file system I believe. In a perfect world there would be a API description telling us how to extend vfs to mount foreign filesystems. However, I fear the world is not perfect

As an alturnative - if it is about data - an NFS export should work well.