What is the difference of the 'parametric' precision between the Point struct and the BatchPoints struct? Please

According to [example_test.go](https://github.com/influxdata/influxdb1-client/blob/master/example_test.go) line 100， I received response `{"error":"partial write: points beyond retention policy dropped=1"}`

But I added `Precision: "s",` in line 104 `bps := client.BatchPoints{}`, this error disappears.

So, I want to ask what is the difference between them.

Thanks！

Read example_test.go around lines 100-104 and compare the Point and BatchPoints uses of Precision. Reproduce the retention-policy error with the example, then document the difference between their precision settings and why the observed result changes.

Written by the indexing model from the issue text.