EDIT: The shader works correctly now, also this needs to be applied to the layer you want to cast shadow and will works with spritesheeting, rotations and will appear in the bottom of the sprites without overlaps due Z-Order.
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This is what i'm looking for:
Parameters i need:
X Offset
Y Offset
Opacity
Blur
Red
Green
Blue
For example the example i posted have:
X Offset = 1
Y Offset = 1
Opacity = 50
Blur = 0
Red = 0
Green = 0
Blue = 0
Optionally add "Angle Fade-Out", to select in which angle do the fade, example image:
Also a parameter for this to select the size of the fade.