ext_open/util.py

def pparent(paths):
	paths = sorted(paths,key=len)
	first = True
	ret = []
	while len(paths) > 0:
		el1 = old_paths[0]
		old_paths = paths[1:]
		paths = []
		for path in old_paths:
			if not paths.startswith(el1):
				paths.insert(0,path)
    return ret