In POSCO unfortunately there is presumption of guilt on the accused person and the burden of proof lies on him only to come out acquitted.
Getting bail in POSCO case is equally very difficult.
However if there is prima facie evidence in support of falsity of the case of false implication of your father in the case then he can get bail from high court.
But before applying for bail in high court do try your luck in sessions court only.
In such offence no separate issuance of warrant is required.The police for the sake of investigation can arrest the FIR named person.