Virtualbox: Mount a shared folder in Guest FreeBSD from Host Ubuntu

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http://unix.stackexchange.com – I have Ubuntu 12.10 as Host OS, FreeBSD 9 as Guest OS in Virtualbox 4.1.18. I have samba installed in both Ubuntu and FreeBSD, and shared few folders from virtualbox, also ticking the automount option. I have also done right click and share in Ubuntu. But when I try to mount in FreeBSD using mount -t vboxfs sharedfolder /home/user/shared it says sharedfolder operation not permitted. I also used mount_smbfs // /home/user/shared but I get can't get server address How to share folder/files between Host Ubuntu and Guest FreeBSD from virtualbox ? (HowTos)