Danny Green has been a member of the Spurs for two-plus seasons. In that time, he has seen point guard Tony Parker hit the floor approximately 6,000 times, give or take, without incident. So when Parker went down again in the third quarter of Friday’s 130-102 victory over Sacramento, Green figured it was business as usual for the Spurs’ 30-year-old All-Star. It was only after Parker had to be helped to the locker room, with teammate DeJuan Blair under one arm and athletic trainer Will Sevening under the other, that Green began to suspect something amiss. “With Tony, you never think it’s anything serious,” Green said. “He’s a tough guy. He can usually play through it or come back faster than usual.” An MRI exam on Parker’s injured left ankle Saturday confirmed a Grade 2 sprain the team’s medical staff estimates will keep the French star out of commission for about a month.