Can you make comments private? i.e I want to send PDF to A&B via cloud, but I dont want A to see B comments and vice versa. Is this doable?

So there is no way to 'segregate' participants? I am wanting to share a file with people who I do not want to be able to see other participants comments. So what is the point of sharing I hear you ask? I want to share with internal staff, but only want external invitees to comment/mark up without seeing the internal discussion about what they have to say, as it may be 'sensitive'. We dont want 2 versions of the document, one internal and one external. We just want to have more control with what information is availabe to read.