How to stretch or shrink subtable inside of resizebox accordingly?

Question

How to resize subtable inside of resizebox? I want to have three-tables side-by-side. However, each table is too wide, so I am using \resizebox. I realized that I need to set the width of subtable, where the effect of the \resizebox is not there. How can we set some sort of relative width?

\begin{table*}
\resizebox{\linewidth}{!}{
  \begin{subtable}[h]{XXX} % how to set XXX?
  \caption{$M=14$}
    \begin{tabular}{r|r|r|r|r|r|r|r|r|r|r|r|r|r|r|r}
       % stuff
    \end{tabular}
  \end{subtable}
\begin{subtable}[h]{XXX} % how to set XXX?
  \caption{$M=14$}
    \begin{tabular}{r|r|r|r|r|r|r|r|r|r|r|r|r|r|r|r}
       % stuff
    \end{tabular}
  \end{subtable}
\begin{subtable}[h]{XXX} % how to set XXX?
  \caption{$M=14$}
    \begin{tabular}{r|r|r|r|r|r|r|r|r|r|r|r|r|r|r|r}
       % stuff
    \end{tabular}
  \end{subtable}
}
\end{table*}