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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.
To create and set permissions on a shared folder. In Windows Explorer, create a folder. Right-click the folder and select Properties. On the Sharing tab, click Share this folder.Specify a share name. By default, the folder name is used for the share name. Specify user limits on the number of open connections if you do not want to use the default values.n Windows Explorer, create a folder. Right-click the folder and select Properties. On the Sharing tab, click Share this folder. Specify a share name. By default, the folder name is used for the share name.