in src/main/java/com/spotify/bigtable/read/ReadCells.java [210:216]
public MultiCellT startTimestampMicros(final long startTimestampMicros) {
final TimestampRange tsRange = TimestampRange.newBuilder()
.setStartTimestampMicros(startTimestampMicros)
.build();
addRowFilter(RowFilter.newBuilder().setTimestampRangeFilter(tsRange));
return multiCell();
}