hyper-v vhd file stored on centos samba server?

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http://serverfault.com – I've got CentOS running a samba server. I've got a Windows 8 Professional running Hyper-V. I'd like to store the vhd files of Hyper-V on a shared Samba folder (protected by a password). It seems that the system user of Hyper-V can't connect to that folder. How can I fix that? ps : I saw that question samba server as network storage for VHD discs but it didn't help me (or I didn't understand it..) (HowTos)