What movie is this scene from (Japanese)

I've always loved the BabyCart movies aka "Lone Wolf and Son" but I can never keep them straight, which one is which. One of them has to my mind one of the greatest opening sequences of any movie from any country. I'll just describe part of it so as not to give away the rest. But if anyone knows the title, please post it. Okay, Ogami Ito boards a small paddle boat, the boats shoves off and he's underway, he's suspicious, he eases out a few inches of sword to utilize its reflection and spies bamboo breathing tubes stalking the little boat. Things ramp up from there. Which one is it? Anyone know? I want to order it.
 
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