[Feature request] Glacier restoration: folder organization

Hi,

The example for retrieving glacier data is really very interesting.
However, I was wondering if there was a possibility of having an organization of files in the form of a tree structure (like on the AWS console for example)? Showing all the keys is fine but when there are millions of files in the folder it is not possible, and it would take a lot of queries to get the size of all the objects.