Need help with nested if in expression

[User13]

Hi,

I am trying to filter values based on selection from a drop down list in a way that if employee "B" is selected from dropdown list, table should show employee "B", his supervisor "A" and his direct reportees "C" and "D"

= IF([Supervisor ]='$(=GetFieldSelections(list))' OR [Employee]='$(=GetFieldSelections(list))'
OR [Employee]= (IF([Employee]='$(=GetFieldSelections(list))',[Supervisor ])),[Employee])

This expression is returning employee "B" and his reportees but not his supervisor 

Looks like there is some issue in this part

[Employee]= (IF([Employee]='$(=GetFieldSelections(list))',[Supervisor ]))

Can you please help to resolve this

Employee	Supervisor
A
B	A
C	B
D	B
E	C