They will germinate at a pretty decent rate usually. Li are usually sterile with no pips in the shell but sugar cane will have seed. They don’t require stratification. They can be hard to crack without damaging the pip inside. I use a pair of small vice grips to open each tip end and then gently crack the shell without crushing the seed. The seed is usually good sized in there so if you use a hammer you’re going to smash the seed. Most are pretty vigorous and will sprout in a week or two just in soil. Some people put them in a slightly moist paper towel in a baggy in a warm spot for a few days and then plant the ones that germinate. I have found that by the time you do that and the cotyledons are above soil the ones you just plant will have reached the same stage at the same time. If you use the damp paper towel trick you will pretty well know which ones are going to germinate and not waste time planting all the seeds. I just like planting them.
Katy