How to turn off all notifications of Android Facebook app? There are many old/partial/... threads about this where I find none of them satisfactory and sufficient. 
I want to turn all notifications off of my Android Facebook app. 
It has not been possible before, so I did not have the app. 
I will uninstall the app if there is no solution for the task. 

I have browsed all Facebook settings but they do not have anything about turning all notifications off. 

I would like to find also System specific block for Facebook App i.e. do not allow it it to show me any notifications. 
It  would be great if you can do this without third party appplications. 

Phone: Oneplus 2
OS: OxygenOS 3.1 (Android 6)
Current solution is the differential solution which I use because the company has no plans and/or motivation to respect the users privacy. 
The company tries to impress users by letting them individually change some features of the app, but does not let the user have complete privacy. 
There are several contact requests to the company but they are not fullfilled. 

Conclusion: uninstall Android Facebook application.