I want find the latest zip file in every directory in a current working directory. I have this code that can find the latest file in one folder:

```
import glob
import os

list_of_files = glob.glob('/path/to/folder/*.zip') 
latest_file = max(list_of_files, key=os.path.getctime)
print latest_file

```

How can I find the latest file in all folders?