Index Of Parent — Directory Better
Google indexes everything it can find. Hackers use specialized search queries called "Google Dorks" to find vulnerable directories instantly. The classic dork for this vulnerability is:
Are you looking to type, or were you trying to find a particular file using search operators? index of parent directory
intitle:"index of" "parent directory"
Nginx (enable):
If you see http://example.com/files/ – the files/ directory is being listed. You can manually try removing parts of the path: Google indexes everything it can find