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Here is the official word from Microsoft TechNet, The C:\Users folder is shared when any sub folders from C:\Users\<username>\ is shared. The article is stale and mostly unhelpful, but worth knowing to complete the story.
Sharing a Folder or Printer in Windows Vista. To share a folder in Windows Vista, do the following: Ensure that file sharing is enabled as described in the âEnabling File and Printer Sharing Optionsâ section of this article. Click Start, and then click Computer.n the Computer window, navigate to the folder containing the folder that you want to share. Right-click the folder that you want to share, and then click Properties. Windows Vista displays the folder properties window. Click the Sharing tab. Figure 6 shows an example.