Sshfs virtualbox Linux host win7 guest

I got sshfs working to access linux host user folders from win 7.

However, I can seemingly only mount linux useraccounts from the linux host on windows guest. That works, but there is no way I can mount any other folders on a server even if they are freely accessible by the user accounts e.g. nfs folders etc with standard nogroup and nouser ownership.

I read the extensive and great nixcraft tutorial on sshfs, but it unfortunately do not address the virtualbox with windows or general virtualmachine guest as an option.

Any pointers how I can use sshfs to access nfs folders on the linux host.
\sshfs\192.168.1.10:/nfsvolume (configured in windows map drive)
is not successful, but useraccounts are.

Is there maybe something on the linux server side I need to do to forward access to the windows client in the virtualbox ?
Cant solve it it seems so I ask.