Access a Mac OS-X shared folder from Linux

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http://www.linuxquestions.org – I have a Mac with OS-X (Mountain Lion) with a couple of folder shares, that is connected to my home network. Now, I also have an Ubuntu 12.04 box connected to the same network and would like to have access to the shared folders in the Mac. Is this possible? If it is, please, explain. Is it also possible the other way around (have access to shared folders in Linux from a Mac)? Thanks. (HowTos)