unflyingobject

Well, there's really no such thing. But you can make it work.
In SA, create a realm where you want your WebDAV home folders to be.
Give Auth/Browse access only to an admin. Then just create something like /etc/httpd/sites/WebDavUsers.conf
and add the following:

<Directory "/WebDAV/folder/username">

  <LimitExcept GET HEAD OPTIONS>

    require user  username

  </LimitExcept>

</Directory>

It seems that Digest authentication under OS X comes automagically from NetInfo which means we don't have to edit any passwordfiles.

Now only the admin can see all the home folders, but each user can connect to http://server/username and see only their home.