The /2/files/get_metadata endpoint gives the following metadata properties for files:
.tag, name, path_lower, path_display, id, client_modified, server_modified, rev, size
It does not return the id of the user that did the last modification. Can this information be obtained? When the file has been shared, the docs suggest there is a sharing_info.modified_by property. Does this mean that we should assume the user who modified the file was the owner of the dropbox if the sharing_info.modified_by property does not exist?
Furthermore, client_modified is not available for folders (i.e. .tag = 'folder'). Does this metadata exist and can be obtained?