Williams admitted to NBA security he visited Magic City strip club in Atlanta on Thursday night … while he was excused from the NBA bubble to attend a family member’s memorial service. Williams claims he was at the gentleman’s club for a “short time” to pick up dinner after the family member’s viewing … which is when Harlow snapped a pic with the vet. In other words … Harlow slipped up and tried to cover for his friend. Williams — who has rejoined the team in Orlando — is now under investigation by the league to determine how long he will have to quarantine.