Oil is ment to be black as its leaving the car as thats all the carbon build up collected through the engine, small shavings can mean nothing but depends on how old the car is the oil has been in there, the better brands of oil are high in zinc and actually have streaks in the oil when you drain it,
Post a pic up of the small filings you have and tell us if its magnetic or not. Alot of the time thought its just stuff being flushed around the system or burs from the head area,
Also cut open your oil fikter to see whats in side aswell