In Google.Apis.Drive.v2.Data.File
class it just provides name of the last modified user. How to obtain full info of the user (like email, user id etc.).
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I figured out how to do it in the Java API. It's far from elegant, but it works.
File file; // start with your file
User user = file.getLastModifyingUser();
Permission permission = service.permissions().get(file.getId(), user.getPermissionId()).execute();
String email = permission.getEmailAddress();
You can also use the RevisionList interface to get all the modifying users.