Williams earned her 130th cap in Sunday's 4-0 friendly win over Sweden to surpass Arsenal Ladies midfielder Rachel Yankey as the most capped England player in history.
Boanas coached Williams earlier in her career at Charlton and the Estonia manager remains a big fan of the technically gifted Liverpool Ladies midfielder.
"Fara is already qualified and started a few years back as an FA skills coach and I am sure she does a bit of coaching at centre of excellence level," he told Sky Sports.
"I would be majorly shocked if she does not remain in the game in a coaching capacity.
"I can certainly see her as a technical coach if not as a head coach - I'm not sure if she sees herself standing in the technical area, but who knows?
"Along with Arsenal's Kelly Smith she has probably been technically ahead of her time in women’s football terms. She has already been a role model for so many young aspiring technical players."
Williams' position on the field has evolved in recent seasons for club and country leading to the midfielder playing in a deeper lying position in the middle of the park.
And Boanas is sure the Londoner is relishing the responsibility of being the engine room of the side for club and country, driving the team forward at every opportunity.
“Adaptability is the key word here and Fara has done exactly that,” said the four-time Baltic Cup tournament winner.
“As you get older you obviously get a little slower so for Fara this was probably a good move and with her experience and footballing brain it has been an easy transition.
“From that position she can still operate as one of the playmakers.
“She has a range of passing that can kick-start an attack and she can still move higher with late runs to exploit spaces in front of the opponents back line. She will be enjoying that role.”
Last week, Liverpool and England striker Natasha Dowie told Sky Sports her team-mate could eventually earn close to 200 caps and Boanas is sure there is plenty more to come from Williams.
He added: “Barring injuries, Fara has got at least a couple more years at the highest level but no doubt she will work hard for it to be even longer, certainly at club level.”