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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.
You can delete a shared data source the same way that you delete any item from the report server. In Report Manager, you open the folder in Details View, select the item, and click Delete. In an application page on a SharePoint site, you open the SharePoint library, select the item, and click Delete.f you plan to use report models for ad hoc reporting, you must create and maintain a shared data source item to provide connection information to the model. A shared data source consists of the following parts: Part. Description. Name. A name that identifies the item within the report server folder hierarchy.