Which packages support DOCSIS 3.1?

I am on the 200 Mbps package.  I have been having slow download speed issues for a month or more, and recently replaced my modem with an Arris (Motorola) SB8200.  It is a DOCSIS 3.1 capable modem. 

The modem has leds on the front that show status.  Solid Green shows a DOCSIS 3.0 signal, while solid blue shows a DOCSIS 3.1 signal.  My modem has a solid green LED.

My question is: what packages support DOCSIS 3.1?  the package I am in is the fastest available in my area.  I would like to enable DOCSIS 3.1 if possible, as it has less latency and jutter than 3.0.

I cannot find any information as to how avaialability of DOCSIS 3.1 is handled by xFinity.