It doesn't have that level of granularity, just four auth scopes:
1) Full access to the account
2) Do everything but permanent deletes of threads and messages
3) Read everything, but no write access
4) Create/read/update/delete drafts and send messages/drafts, but no access to anything else
Finer-grained access (especially for reads, but there are some use cases for finer-grained sending controls, too) would be better, but this is, AFAIK, a step ahead of any other email API.
EDIT: source https://developers.google.com/gmail/api/auth/scopes