Reports emerged on Saturday afternoon that Griffiths had been arrested following an incident in a supermarket and Hibs later confirmed the 22-year-old had been involved in a police matter.
But the on-loan Wolves striker started Sunday's 0-0 Clydesdale Bank Premier League draw against Aberdeen and Williams came to his team-mate's defence after the game.
Williams said: "Sparky, in and around the football club, is fantastic.
"He's a hard worker and we don't have any problems with him at all, either in training or the games. His ability is there for all to see.
"There are little controversies that follow him, and whatever reasoning or background is between him and them. We're just happy to have him at the club for the ability he brings."
Williams, who saved Niall McGinn's penalty at Pittodrie, added: "I don't know much about what's gone on. I think he's been a little bit unfortunate and a bit naive at the situations he gets himself in.
"Everyone's spoken to him at length. James McPake speaks to him well, and the manager speaks to him at length.
"He's not a vindictive or nasty person. You see him day to day, and there's not a bad bone in his body, so I'm sure whatever keeps getting him into trouble can be addressed.
"He's got everything you need to be a top, top footballer, and he's showed that this season. We as a group know the talent he brings, and welcome him with open arms every day."