def describe_mount_target_security_groups(MountTargetId=None):
    """
    Returns the security groups currently in effect for a mount target. This operation requires that the network interface of the mount target has been created and the lifecycle state of the mount target is not deleted .
    This operation requires permissions for the following actions:
    See also: AWS API Documentation
    
    Examples
    This operation describes all of the security groups for a file system's mount target.
    Expected Output:
    
    :example: response = client.describe_mount_target_security_groups(
        MountTargetId='string'
    )
    
    
    :type MountTargetId: string
    :param MountTargetId: [REQUIRED]
            ID of the mount target whose security groups you want to retrieve.
            

    :rtype: dict
    :return: {
        'SecurityGroups': [
            'string',
        ]
    }
    
    
    :returns: 
    (string) --
    
    """
    pass
