If I share the "My Documents" Folder with the homegroup, on another computer connected to the homegroup, in explorer under homegroup it only shows the documents folder, but if I click on Network in explorer, then on the computer name with the shared "My Documents" Folder, It shows the C:\Users directory, and I can then browse through all the users and the files including the AppData folders. I can even copy files in folders I don't want listed.