[Libguestfs] Mounting Snapshots

Hello I am doing a research project (http://www.ites-project.org/) and want to be able to mount VM images (all kinds of VMs, starting with VirtualBox). For that libguestfs seems perfect. I am already able to mount the base HD, but I was not able to additionally mount the overlaying Snapshot files. Is there a way to mount several HD files onto each other ? Thanks Thorsten Sick -- Thorsten Sick Research Direct: +49 7542-500 4252 Email: thorsten.sick(a)avira.com -- Avira Operations GmbH & Co. KG Kaplaneiweg 1 | 88069 Tettnang | Deutschland / Germany Telefon / Telephone: +49 7542-500 0 Telefax / Facsimile: +49 7542-500 3000 Registergericht: Amtsgericht Ulm, HRA 722586 | USt.-IdNr.: DE 815289569 | Pers. haftende Gesellschafterin: Avira OP GmbH | Firmensitz: Tettnang | Registergericht: Amtsgericht Ulm, HRB 726712 | Geschäftsführer: Travis Witteveen Commercial Register: Amtsgericht Ulm, HRA 722586 | VAT-ID: DE 815289569 | Personally Liable Partner: Avira OP GmbH | Headquarters: Tettnang | Commercial Register: Amtsgericht Ulm, HRB 726712 | Chief Executive Officer (CEO): Travis Witteveen