The Fancy Footwork feature of the swashbuckler rogue says:
At 3rd level, during your turn, if you make a melee attack against a creature, that creature can’t make opportunity attacks against you for the rest of your turn.
The bardic College of Swords slashing flourish feature says:
You can expend one use of your Bardic Inspiration to cause the weapon to deal extra damage to the target you hit and to any other creature of your choice that you can see within 5 feet of you. The damage equals the number you roll on the Bardic Inspiration die.
If I use the slashing flourish attack and hit 4 other creatures around me with it, does fancy footwork affect all of them so they cannot make opportunity attacks against me?