Rinsing off canned fruit can reduce the calories from the canned fruit because when you rinse the canned fruit you rinse off the sugar content from the fruit.
The less sugar content you intake the less calories you'll intake as well.
The syrup in the canned fruit also contains calories so by draining off the syrup you reduce the calories from the canned fruit as well.
So to make the canned fruit the healthiest and especially if you don't want to have a lot of calories you can drain the canned fruit syrup and rinse the canned fruit in the water to remove the sugar and calorie content.
Still even with the syrup and sugar the canned fruit is still pretty healthy however the canned fruit is much healthier without the sugar content and syrup.