\documentclass{article}
\usepackage[all]{xy}
\usepackage[lite]{folarrow}
\begin{document}
\[
\xymatrix{
V \ar[r] & E \ar[d]|@{fol}^{\folpad{\pi}} \\
         & M }
\qquad
\xymatrix{
E \ar[r]|@{fol} & B \ar[d]|@{fol} \ar[dl]|@{fol} \\
M \ar[u]|@{fol} & N \ar[l]|@{fol} }
\]
\end{document}