My understanding is that placing a file in multiple parent folders is no longer allowed on Drive (per the announcement of the single-parent model).
Using Google Apps Script methods (specifically DriveApp methods) to find the parent of a file, it seems I still have to obtain a folder iterator first using file.getParents(). Then use the folder iterator to find the parent folder.
Is this correct? I don't understand why there isn't a file.getParent() method now that would directly provide the parent folder.