Pep Guardiola's relentless side knocked the Red Devils off top spot on January 26 and have gone on to build a 10-point lead at the summit.
City maintained their momentum with victory over Arsenal on Sunday afternoon, while United's 3-1 win against Newcastle prevented them from losing further ground.
It was just a second success in six Premier League matches for boss Ole Gunnar Solskjaer, who spoke of the need to keep plugging away and remain focused on what his team can control, comments echoed by forward Rashford.
"He's a player that has a lot of quality and, the more often he trains with us and plays with us, he's going to feel relaxed and then he can show his quality on the pitch.
"I think in the academy they always emphasise following in footsteps.
"It's something that I always took great acknowledgment of when I was a young player wanting to get into the first team, follow in the footsteps of other attacking players, other academy players that have made the step up into the first team.
"It's just a cycle, really. Hopefully the younger ones that are his age now, they'll see him playing and they'll kick on and then hopefully we'll get more and more of them in."
While United look to Thursday's Europa League round-of-32 second leg against Real Sociedad, Newcastle turn their attention to Saturday evening's clash with Wolves.
Fulham's recent resurgence means under-fire Steve Bruce's side are just three points above the relegation zone after the loss at Old Trafford, where an encouraging hour was followed by all too familiar final outcome.
Goalscorer Saint-Maximin said: "We play against one of the best teams in the league and we know every game in the Premier League is difficult.
"We play in Old Trafford against a really good team and we stay in the game in the first half, 1-1. We keep going, run a lot, try to press to make the game difficult for Manchester United. But they score after with James and the penalty, so we're really disappointed."