First and foremost, are you seeing any performance issues? If not, then it might not be worth worrying about. There are all kinds of messages generated in Console logs on a continuous basis; some from lazy coders, others being just information messages, still others being legit issues that range from trivial to severe. If you're not seeing any crashes or other issues other than this popping up in Console, then I wouldn't worry too much about it.
Otherwise: Do you have File Sharing turned on in the Preferences pane (under Sharing)? If so, then this is why Samba is active. Unchecking the File Sharing option might get Samba to quiet down.