Finding what object is mounted to the object

I have been looking through the reference and the forums, saw one person ask this before but didn't see an answer for it. Is there a function to get what object is mounted to another object? I see one that will give you a true false if an object is mounted on it but that's about it. I saw in the blog of the new release a function called getattachedobject and was not sure if this does what I need. I searched in the doc and site to see what this new function oes and got no reference other then the blog. So is there a function for this or do I just need to make one that checks all the objects in the scene by the parent checking function?