I think this exception works incorrectly

I got this in my .gitignore:
```

# backups
*/backup/*
!*/backup/backup.sh
```

I'm printing this and get:
```
>print(filepath, matches_gitignore(filepath))
notebooks/backup/10-07-20:21:21/backup.dump False
```
So it does mark it as False, which is I think incorrect. 
While in my git setup all files in /backup get ignored, except for `backup.sh`