Not possible to create a sparsebundle image on a SMB mounted Volume

I'm trying to create a sparse bundle image from Disk Utility directly on my NAS (through a mounted smb volume):

I then get the following error after a few seconds:

Creating a sparseimage the same way works perfectly. I however wanted to go to a sparse bundle as the file is afterwards synchronized with Google Drive and sparsebundle are seen as folders and are then more sync-friendly.

I'm on 10.10.1.

Info about the mounted volume: