Parenthesize a breath sign

[Tommaso Gordini]

Hello to all,

this is the code:

\new Staff \relative c'' {

\key es \major

\time 3/4

\override BreathingSign #'text = \markup { \musicglyph #"scripts.upbow" }

\once \override ParenthesesItem #'font-size = #0

es8[-\parenthesize \trill d es f

\once \override ParenthesesItem #'font-size = #0

g]-\parenthesize \breathe f |

}

Is there a way to parenthesize a sign of breath? Because it works with \ trill and not with \ breathe? 

Ciao e grazie

Tommaso