  This note establishes an interior quantitative lower bound for nonnegative
supersolutions of fully nonlinear uniformly parabolic equations. The result may
be interpreted as a nonlinear, quantitative version of a growth lemma
established by Krylov and Safonov for nonnegative supersolutions of linear
uniformly parabolic equations in nondivergence form. Our approach is different,
and follows from an application of the Fabes-Stroock estimate. The result is
the parabolic analogue of an elliptic regularity estimate established by
Caffarelli, Souganidis, and Wang in the stochastic homogenization of fully
nonlinear uniformly elliptic equations.
