I will point out here that Stratum (the protocol for communication between pools and mining equipment) does not support overt or covert ASICBoost.
Mining Profitability and ASICBoost
Jimmy Song
304

I could be wrong, but I believe this statement is incorrect and has been proven false several times. Reddit user bip37 posted the exact Stratum command needed by the S7 to enable ASICBOOST only for Antpool.

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