How to convert a figure using matlab2tikz expressing the dimensions in millimiters

I am trying to convert a matlab figure to a figure.tex file in which the measures (axis, fonts, etc....) are specified in SI (meters, centimeter or millimetres). The default seems to be inches.

I saw on the net a possible guess for setting that on matlab:

    set(figure(1),'Units','centimeters')
    matlab2tikz('figurehangle',figure(1),'filename','myfile.tex')

but inside myfile.tex the dimensions are still expressed in inches. Any solution?