title: How do I see if some folder is a child of another using NSURL?
body: <p>I have an <code>[URL]</code> which represent a set of special parent directories. I am given another <code>[URL]</code> which represents files scattered around the system. I want to know if any of these files are in any of my special directories, or any of their subdirectories. <strong>Is there a simple/intended way to do this, without manually parsing/traversing an absolute URL's path?</strong></p>