How to get the 95th percentile value in prometheus

i have an influxDB query to calculate the 95th percentile value, is there a way to translate it into a prometheus query ?

InfluxDB query :

SELECT percentile("counter_rate", 95) *8 FROM "counter_name" WHERE ("role" =~ /^$role$/) AND $timeFilter GROUP BY time(30d)

I've tried this but it doesn't seems working :

quantile_over_time(0.95,rate(counter_name{role=~"$role"}[$__range])[30d:]) *8 

Is there any help please ?