Microsoft announced SAS for File Share in the new Azure SDK 5.0.

Other than the Stackoverflow question, I didn't find much references on that. 

Stackoverflow:

Tool or usage example to generate and view SAS (Shared Access Signatures) of both Azure Block Blob and Azure File Share

EverDir.com is a free tool, very much like Windows Explorer, that helps to manage your blobs and Azure files given either full account information or SAS key.