Unable get root directory on jailbroken device

Thank you for your git.

I try to get root directory on my jailbroken device, but it only show content like AFCCrashLogDirectory.
My code here: 

```
AFCRootDirectory *rootDirectory = [device newAFCRootDirectory];
NSArray *rootContent = [rootDirectory directoryContents:@""];
NSLog(@"root = %@", rootContent);
```

Help me, please!