  Let $g$ be an exceptional Lie superalgebra, and let $p$ be the maximal
parabolic subalgebra which contains the distinguished Borel subalgebra and has
a purely even Levi subalgebra. For any parabolic Verma module in the parabolic
category $O^p$, it is shown that the Jantzen filtration is the unique Loewy
filtration, and the decomposition numbers of the layers of the filtration are
determined by the coefficients of inverse Kazhdan-Lusztig polynomials. An
explicit description of the submodule lattices of the parabolic Verma modules
is given, and formulae for characters and dimensions of the finite dimensional
simple modules are obtained.
