“They can’t f–k with me,” Dan Snyder reportedly has said privately as the Washington owner allegedly collects “dirt” on the Cowboys’ Jerry Jones. FRISCO – Dallas Cowboys owner has long been a mentor and friend to embattled Washington Commanders owner Daniel Snyder. But that relationship figures to be on shaky ground given that Snyder reportedly hired private investigators to look into his fellow owners and NFL commissioner Roger Goodell. Per ESPN’s Don Van Natta Jr., Seth Wickersham and Tisha Thompson, multiple team owners are aware that Snyder instructed his law firms to hire investigators, with one owner allegedly being told…