The ornamental design for top portion of a snowboard binding, as shown and described.
FIG. 1 shows a perspective view of a top portion of a snowboard binding showing my new design. The broken lines in the drawing are for illustrative purposes only and form no part of the claimed design.
FIG. 2 shows a front elevational view of the top portion of a snowboard binding shown in FIG. 1;
FIG. 3 shows a rear elevational view of the top portion of a snowboard binding shown in FIG. 1;
FIG. 4 shows a left side elevational view of the top portion of a snowboard binding shown in FIG. 1;
FIG. 5 shows a right side elevational view of the top portion of a snowboard binding shown in FIG. 1;
FIG. 6 shows a top plan view of the top portion of a snowboard binding shown in FIG. 1; and,
FIG. 7 shows a bottom plan view of the top portion of a snowboard binding shown in FIG. 1.