Google Drive SDK Permissions by file/folder
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We are creating a desktop application that connects to the Google Drive and perform some processing in pictures selected by the user. Note that the pictures are stored there by any means (let's say the user uploaded them using the desktop Google Drive sync tool).

Per this https://developers.google.com/drive/apps_overview the App can request permissions to either the files created by the Drive App, or to all the files. 

It seems that if you create a Web Google Drive application the user would have the choice of granting permissions in a file-by-file basis.

However, what we would like if for the user to grant folder permissions to our Google Drive Desktop Application, so our software can only see the folders/files explicitly granted by the users to our application.

Otherwise we need access to all their files, and that is kind of a security concern for the user (if they have all sort of files, some might be even be sensitive, why would they give us access to that if we are working only with a subset).

Note: in my testing I am using OAuth 2, and it works fine. It is just that we are forced to request the full permissions. We are using .NET, not that it matters. 

Thanks.