See https://tools.ietf.org/html/rfc2088
A GETMETADATA response may look as follows:
```
* METADATA "Some Folder" (/private/vendor/kolab/activesync {49}
{"FOLDER":{"229SJOKJJ109D3VTB8CGL1221C":{"S":1}}})
```
A differential for a test case will be attached.