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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 set permissions on a shared folder by using the Windows interface. 1  Open Computer Management. 2  If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Yes. 3  In the console tree, click System Tools, click Shared Folders, and then click Shares.