According to OneNote in the Microsoft Graph API (in Preview) it should be possible to retrieve and access notebooks owned by the user and shared by other users (plus O365 group notebooks).
However, executing https://graph.microsoft.com/beta/me/notes/notebooks just returns my (owned) notebooks (not the shared ones). So maybe I'm doing something wrong here, but how do I list all notebooks that my user has access to (owned as well as shared) using the Graph API?