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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.
Access the folders. Select the user name of the location where the shared folders or files are stored. Provided that the network user is permitted access to the shared folder, all files and sub-folders stored there will be available.elect the user name of the location where the shared folders or files are stored. Provided that the network user is permitted access to the shared folder, all files and sub-folders stored there will be available.