Filter for shared or unshared

If would be be great to be able to filter for only shared or unshared references. Especially due to the fact that tags are not shared, any semblance of organisation in a shared folder requires folders. Unless there is a mirrored folder tree in a personal library, it then becomes very tricky to know what has and has not been shared at a glance. Without subfolders, I just select all my personal library and share to the shared folder, but once sub-folders are set up, this becomes much trickier. A filter to see all unshared files in my personal library would be great and would allow me to quickly see what I have forgotten to share and have the option to share it. Also an indication of in which folders a reference is shared would be nice.