WebDAV Problem--too many files shared

[FredT2]

I am setting up iOS file sharing using WebDAV on Lion Server. The goal is to allow students in the classroom save and retrieve their Pages and Keynote documents. I enabled a single shared folder, the Groups folder at the root level. When we log on from the iPad, that folder shows up as expected, but also the entire folder hierarchy of the user account that logged in! Naturally I had not shared them, though Users is shared by default for file sharing, but not for iOS sharing. Removing users from file sharing did not change this behavior. Although I don't expect that there is much harm that could be done from iPads, I don't want to have to be chasing down files scattered all of the computer. Is there something I am missing, or is this a bug?