Remove "Server: Apache" from response headers

I want to know how to remove the Server header completely that apache sends in the response.

Initially, it was showing full server info like Server: Apache (Ubuntu 14.04) in the response headers.But I read somewhere to add this in apache2.conf

ServerTokens ProductOnlyServerSignature Off

It didn't remove the header but only changed it to Server: Apache

I even tried from PHP to remove that header with header_remove('Server');. But still no luck.

So, I want to remove that completely.

Thanks,

PS: if it's possible to change the value to a fake value for eg: Server: Microsoft-IIS/8.0 then it is fine too.