How much does it matter? That’s the question Sheldon Keefe and the Maple Leafs are wrestling with right now as the playoffs draw near: How much does it matter that Ilya Samsonov has a ridiculous 18-2-3 record — a points percentage of nearly .850 — when he’s played in Toronto this season? How much does it matter, that is, for what comes next in the postseason? Do the Leafs give Samsonov the starting nod in Game 1, likely to be at home against the Lightning, because he’s been so dominant in that building? Advertisement And perhaps even lean Matt Murray’s…