Adding Font Features to only certain Font Shapes

Question

How do I add some font features (such as ligatures) to only certain font shapes?
The ideas is to disable ligatures for RB, RBI shapes, etc. since they give me a warning anyway.
I briefed over the documentation, but to no avail.
MWE (not compilabile without font files)
documentclass{article}
usepackage{fontspec}

defaultfontfeatures[LinLibertine_]{
    Extension      = {.otf},
    UprightFont    = {*R},
    BoldFont       = {*RB},
    ItalicFont     = {*RI},
    BoldItalicFont = {*RBI},
    Ligatures      = {Common, Rare, Historic, TeX}, 
    Numbers        = {OldStyle},
}

setmainfont{LinLibertine_}

begin{document}
textbf{ff fi fl...}
end{document}

Davislor · Accepted Answer

Use the options BoldFeatures={ Ligatures={...}}, and so on.
documentclass{article}
usepackage{fontspec}
usepackage{lipsum}

defaultfontfeatures[LinLibertine]{
    Extension      = {.otf},
    UprightFont    = {*_R},
    UprightFeatures = { Ligatures  = {Common, Rare, Historic, TeX}},
    BoldFont       = {*_RB},
    BoldFeatures = { Ligatures = {Common, Historic, TeX}},
    ItalicFont     = {*_RI},
    ItalicFeatures = { Ligatures  = {Common, Rare, Historic, TeX}},
    BoldItalicFont = {*_RBI},
    BoldItalicFeatures = { Ligatures = {Common, Historic, TeX}}, 
    Numbers        = {OldStyle},
}

setmainfont{LinLibertine}

begin{document}
lipsum
end{document}

You could also try turning Ligatures=Rare on by default and off for a particular face, with BoldTialicFeatures={ Ligatures=NoRare }.

Adding Font Features to only certain Font Shapes

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