How to run DiskWarrior to repair the directory of a virtual machine?

...to repair the directory of a VMware Fusion Virtual Machine of Mac OS X Server 10.6.8 (Snow Leopard Server) in VMWare Fusion 5.0.3 on OS X 10.8.3 (Mountain Lion)?

I do not mean to repair the directory of the host Mac (Mountain Lion) which can be done booting from any other disk and running DiskWarrior, but to repair the directory inside the virtual machine itself (Snow Leopard Server).

Thanks.