In linux, one of the great things you could do (for developers, in particular) was to mount a folder and locally bind it to another folder on the system.
This had the advantage over symlinks due do the fact tools like Git didn't detect it as being a different type of node, and you didn't need to remove the original contents. When you were done, you could simple unmount and you were left with the original filesystem contents.
mount -bind or
mount.local don't seem to exist on Mac (as of OS X 10.10.2, Yosemite).
How do you go about this?